5991+599.1+59.91+5.991怎么简便计算

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5991+599.1+59.91+5.991怎么简便计算5991+599.1+59.91+5.991怎么简便计算5991+599.1+59.91+5.991怎么简便计算5991+599.1+59.91

5991+599.1+59.91+5.991怎么简便计算
5991+599.1+59.91+5.991怎么简便计算

5991+599.1+59.91+5.991怎么简便计算
5991+599.1+59.91+5.991
=6000+600+60+6-9-0.9-0.09-0.009
=6666-9.999
=6666-10+0.001
=6656.001

原式=(6000-9)+(600-0.9)+(60-0.09)+(6-0.009)
=6666-9.999
=6656.001

5991+599.1+59.91+5.991
=6000-9+600-0.9+60-0.09+6+0.009
=(6000+600+60+6)-(9+0.9+0.09+0.009)
=6666-9.999
=6666-10+0.001
=6656+0.001
=6656.001